Trimesic acid modified polyamide

Claim 1

A FIBRE-FORMING POLYAMIDE FORMED BY HEAT REACTING A COMPOSITION COMPRISING A REACTANT FROM AT LEAST THE FIRST TWO OF THE FOLLOWING THREE GROUPS OF POLYAMIDEFORMING REACTANTS: (1) DIAMINES AND AMIDE-FORMING DERIVATIVES THEREOF, (2) DICARBOXYLIC ACIDS AND AMIDE-FORMING DERIVATIVES THEREOF, AND (3) AMINO-CARBOXYLIC ACIDS AND AMIDE-FORMING DERIVATIVES THEREOF, THE REACTANTS OF GROUPS (1) AND (2) BEING PRESENT IN ESSENTIALLY EQUIMOLECULAR PROPORTIONS, A MODIFIER SELECTED FROM THE GROUP CONSISTING OF TRIMESIC ACID AND AMIDE-FORMING DERIVATIVES THEREOF AND WHEREIN SAID AMIDE-FORMING DERIVATIVES ARE SELECTED FROM THE GROUP CONSISTING OF ESTERS, AMIDES AND PREFORMED SALTS OF SAID ACID WITH DIAMINES PRESENT IN AN AMOUNT BETWEEN 0.3 TO 3.1, MOLAR PERCENT OF THE TOTAL DICARBOXYLIC ACID AND AMINO-CARBOXYLIC ACID CONTENT OF SAID COMPOSITION, AND A CORRESPONDING ESSENTIALLY EQUIVALENT PROPORTION OF DIAMINE.